seer-v2.1.0

This release adds +70 to +100 elo in self play over v2.0.1 depending on the configuration. The entirety of this strength increase can be attributed to search improvements as this release features the same network bundled with v2.0.1 trained via retrograde learning. Many thanks to everyone involved with the OpenBench project for making Seer's continued development feasible. In particular, thanks to Andrew Grant for developing and maintaining OpenBench and Bojun Guo (noobpwnftw), the primary OpenBench contributor.

ELO   | 104.23 +- 3.58 (95%)
CONF  | 8.0+0.08s Threads=1 Hash=32MB
GAMES | N: 20000 W: 8373 L: 2547 D: 9080

Note that as of v2.1.0, I'm only officially supporting AVX/AVX2 processors and requesting that testers please refrain from testing binaries for older processors found in the "unsupported.zip" attached below. For casual use as well as unofficial rating lists, feel free to use the unsupported binaries if none of the supported binaries prove compatible.